Heat pump external element in a courtyard vs on a roof

[Garald]

As you know from my other thread, my architect was working (since mid-October) on a design for heat-pump placement that couldn't possibly work. (I'm surprised now that a heat-pump installer either let himself be convinced or convinced her that this was possible.) Now we have two alternatives that I can see:

 

1) installing the external element on the roof (probably optimal, though now the architect is saying this will involve delays and fees (payable to her), as well as reinforcing the roof (why that would be necessary, given that, say, the external unit of a Yutaki S weighs 44kg, I do not know)

2) installing the external element on the courtyard (this, I understood, was her plan B, and may make her less unhappy). She never liked this idea all that much, but at least, she says, sound-pollution regulations would be respected, even though this is a small courtyard.

 

My question: is 2) a good or even a feasible option? The (shared) coop courtyard has walls on all sides, though on one short side (and part of the adjacent long side) the walls are just one story high.

 

Here is the courtyard. For scale, the house (labelled "R+1+C" here) is about 8.75m wide.